Extracellular Vesicles-Induced Cell Homing and Odontogenesis via microRNA Signaling for Dentin Regeneration

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Stem Cell Biology

Background:

• Reparative tertiary dentinogenesis relies on dental pulp stem cells (DPSCs) recruitment and differentiation.
• Extracellular vesicles (EVs) mediate tissue repair via intercellular communication, influencing cell behavior.
• EVs are emerging as key players in regenerative medicine for their therapeutic potential.

Purpose of the Study:

• To investigate the effects of DPSCs-derived EVs on DPSC homing and odontogenic differentiation.
• To assess the efficacy of EVs in promoting dentin regeneration.
• To identify specific EVs components involved in these processes.

Main Methods:

• Isolation and characterization of DPSCs-derived EVs (EV-G and EV-O).
• Evaluation of EV effects on DPSC chemotaxis, proliferation, and gene/protein expression of odontogenic markers.
• Assessment of dentin regeneration in a rabbit partial dentinotomy/pulpotomy model.
• Identification of key microRNAs within EVs.

Main Results:

• A high dosage of EVs (5 × 10⁸ EVs/mL) significantly enhanced DPSC chemotaxis and proliferation.
• EV-O treatment upregulated key odontogenic markers (COL1A1, RUNX2, ALP).
• EV-O significantly enhanced dentin regeneration (approx. 55%) in vivo.
• Specific microRNAs (miR-21-5p, miR-221-3p, miR-708-3p) were identified in EV-O.

Conclusions:

• EVs derived from DPSCs effectively promote DPSC homing and odontogenic differentiation.
• EV-based therapy demonstrates significant potential for dentin regeneration.
• This strategy offers a promising therapeutic approach for dental pulp repair and regeneration.